131213009 has 2 divisors, whose sum is σ = 131213010. Its totient is φ = 131213008.

The previous prime is 131212951. The next prime is 131213029. The reversal of 131213009 is 900312131.

It is an a-pointer prime, because the next prime (131213029) can be obtained adding 131213009 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129322384 + 1890625 = 11372^2 + 1375^2 .

It is a cyclic number.

It is not a de Polignac number, because 131213009 - 2²⁴ = 114435793 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (131213029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65606504 + 65606505.

It is an arithmetic number, because the mean of its divisors is an integer number (65606505).

Almost surely, 2^131213009 is an apocalyptic number.

It is an amenable number.

131213009 is a deficient number, since it is larger than the sum of its proper divisors (1).

131213009 is an equidigital number, since it uses as much as digits as its factorization.

131213009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 131213009 is about 11454.8247040276. The cubic root of 131213009 is about 508.1504310420.

The spelling of 131213009 in words is "one hundred thirty-one million, two hundred thirteen thousand, nine".